rdblue opened a new pull request #45: Lazily submit tasks in ParallelIterable and add cancellation. URL: https://github.com/apache/incubator-iceberg/pull/45 This removes the planner pool from ParallelIterable, which was used to submit all of the iterable tasks in parallel. This was used to queue up tasks to read every manifest in a snapshot. However, when a caller stopped reading early, all tasks would still run and add results to the queue. Now, tasks are submitted from the thread consuming the iterator as it runs hasNext. If the caller stops consuming the iterator, then no new tasks are submitted. This also keeps track of the submitted tasks and will cancel them when the iterator is closed.
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